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This paper analyzes the structure and modem scheme of Chirp-BOK system. In Additive White Gaussian Noise channel, an approach of studying the performance of Chirp-BOK is presented and the BER-SNR result is evidently improved compared with traditional BOK. Furthermore, the BER of multiuser Chirp-BOK system is discussed. Chirp Spread Spectrum (CSS) is receiving more and more attention as the IEEE 802.15.4a standard includes it as one of the two optional PHYs. CSS, used only in radar system in the past, becomes a rational choice for Low-Rate Wireless Personal Area Networks (LR-WPAN) defined by IEEE 802.15.4a.
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